Long Island’s largest mass of carcinogenic groundwater pollution, the Grumman plume is expanding a foot a day from Bethpage toward the Great South Bay, centerpiece of the region’s South Shore estuary system.
The spread of its 24 contaminants, most notably the cancer-causing solvent trichloroethylene, or TCE, contrasts markedly with the shrinking of a similarly toxic groundwater plume from the property of the Brookhaven National Laboratory, 35 miles east.




















